package com.atguigu.web;

import com.atguigu.pojo.Book;
import com.atguigu.pojo.Page;
import com.atguigu.service.BookService;
import com.atguigu.service.impl.BookServiceImpl;
import com.atguigu.utils.WebUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/**
 * @author 徐州城
 * @version 1.0
 */
public class BookServlet extends BaseServlet{
    private BookService bookService = new BookServiceImpl();

    protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1、请求的参数==封装称为Book对象
        Book book = WebUtils.copyParamToBean(req.getParameterMap(),new Book());
        //2、调用BookService.addBook()保存图书
        bookService.addBook(book);
        //3、跳到图书列表页面，/manager/bookServlet?action=list
        //req.getRequestDispatcher("/manager/bookServlet?action=list").forward(req,resp);
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 0);
        pageNo++;
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + pageNo);
    }


    protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1、获取请求的的参数id，图书编号
        int id = WebUtils.parseInt(req.getParameter("id"),0);
        //2、调用bookService.deleteBookById(); 删除图书
        bookService.deleteBookById(id);
        //3、重定向回图书列表管理页面，/book/manager/bookServlet?action=list
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));
    }


    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1、获取请求的参数==封装成为Book对象
        Book book = WebUtils.copyParamToBean(req.getParameterMap(),new Book());
        //2、调用BookService.updateBook( book); 修改图书
        bookService.updateBook(book);
        //3、重定向回图书的列表管理页面，地址：/工程名/manager/bookServlet?action=list
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));
    }

    protected void getBook(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1、获取请求的参数图书编号
        int id = WebUtils.parseInt(req.getParameter("id"),0);
        //2、调用bookService.queryBookById() 查询图书
        Book book = bookService.queryBookById(id);
        //3、保存到图书到Request域中
        req.setAttribute("book",book);
        //4、请求转发到。 pages/manager/book_edit.jsp页面
        req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req,resp);
    }


    protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1、通过bookService查询全部图书
        List<Book> books = bookService.queryBooks();
        //2、把全部图书保存到Request域中
        req.setAttribute("books",books);
        //3、请求转发到/pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }

    //处理分页功能
    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1、获取请求的参数 pageNo和pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"),1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"),Page.PAGE_SIZE);
        //2、调用BookService.page(pageNo, pageSize)：(返回)page对象
        Page<Book> page = bookService.page(pageNo,pageSize);
        //设置 请求地址
        page.setUrl("manager/bookServlet?action=page");
        //3、保存page对象到 request域中
        req.setAttribute("page",page);
        //4、请求转发到 /pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }

}
